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Receiving Different HGL Results when switching from Elev-Area to Elev-Volume Curve in a Pond (CivilStorm)

Good afternoon,

I am working on a combined sewer network routing model.  As part of the model, I have two proposed ponds (forebay and main wetland).  I have found that my maximum HGL results in the ponds are different when I switch from Elevation-Area to Elevation-Volume.  Note that I calculated the elev-volume curve using the elev-area curve and the conic approximation.  

Is it possible that the max HGL difference is due to linear interpolation between increments of the Elev-Volume curve?

The forebay/wetland HGL increases roughly 1.5 ft when switching from Elev-Area to Elev-Volume, so this is not an insignificant issue. 

Thanks,

Seth